diff --git a/webserver/requirements.txt b/webserver/requirements.txt
index c4becc3..c05eecb 100644
--- a/webserver/requirements.txt
+++ b/webserver/requirements.txt
@@ -52,7 +52,7 @@ python-dateutil==2.8.0
 python-dotenv==0.10.3
 pytz==2018.9
 # pywin32==225
-PyYAML==3.13
+PyYAML==5.4
 requests==2.20.1
 s3transfer==0.2.1
 scipy==1.3.0